| Period | Million units |
|---|---|
| - | - |
| - | - |
| - | - |
| - | - |
| - | - |
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Source
Release date
September 2009
Region
North America
Survey time period
1990 to 2009
Number of respondents
1,028 respondents
Supplementary notes
* Numbers from 2010 to 2015 are forecast.
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